Python error: resource u’tokenizers / Punkt/ english.pickle ‘ not found.

Error details
resource u’tokenizers / Punkt/ english.pickle ’ not found. Please
use the NLTK Downloader to obtain the resource: >>>
nltk.download ()


resolvent:

Terminal enter the following code:
Python
Import nltk
nltk.set_ proxy("**. com:8080 ","username","password")
nltk.download ()
then the nltk downloader dialog box pops up, and select download. The result is shown in the figure below.

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